Modelling of microstructure of asr influenced cement-based materials

Modelling of microstructure of asr influenced cement-based materials

Qiu, Xiujiao (Universiteit Gent)
Chen, J. (TU Delft Materials and Environment)
Ye, G. (TU Delft Materials and Environment)
De Schutter, Geert (Universiteit Gent)

Ye, Guang (editor)
Dong, Hua (editor)
Liu, Jiaping (editor)
Schlangen, Erik (editor)
Miao, Changwen (editor)

2021

ASR (alkali-silica reaction) is one of the toughest durability problems in engineering. However, the damage induced by ASR is still fairly unpredictable due to the lack of microstructural information of cement-based materials affected by ASR, while the microstructure determines the global performance. In order to fill this gap, a multiscale simulation model of ASR is under development. The basic theory and assumptions about this multiscale model can be found in [8]. This paper illustrates how the microstructure evolution of cement-based materials induced by ASR is achieved by this model. In the model, the entire chemical process including dissolution of reactive aggregate, nucleation and growth of ASR products (alkali silicate complex, calcium alkali silicate complex), is quantitatively simulated based on the kinetic and thermodynamic parameters. Furthermore, the 3D heterogeneous aggregate is numerically simulated using stereology based on the data from 2D thin-section. As a result, the dissolution degree of aggregate, the amount and location of ASR products and the porosity change can be traced. These micro parameters can be used for the simulation of crack formation in mesoscale. Similarly, the macroscale damage can be predicted based on the simulation results from mesoscale.

ASR
microstructure;
multi-scale modelling
heterogeneous aggregate
kinetics and thermodynamics

http://resolver.tudelft.nl/uuid:1095c615-9fb4-473c-85f6-9de062a0ad65

Delft University of Technology

978-94-6366-422-6

4th International Rilem Conference on Microstructure Related Durability of Cementitious Composites: Microdurability 2020

4th International Rilem Conference on Microstructure Related Durability of Cementitious Composites, 2021-04-29 → 2021-05-27, Online, Delft, Netherlands

Institutional Repository

conference paper

© 2021 Xiujiao Qiu, J. Chen, G. Ye, Geert De Schutter